Traditional mechanical methods of retaining restorative materials have been replaced to a large extent by tooth conserving adhesive restorative techniques. Bonding techniques allow more conservative tooth preparation. Less reliance on macromechanical retention and less removal of unsupported enamel because adhesives have been evolving, so rapidly for the last few years, as the timing is right for evaluating the clinical status of present day adhesives. The purpose of this article is to provide a concise, comprehensive and updated classification of dentin bonding agents. Current products are highlighted to improve clinical use and performance of the materials.
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